OV-8 8.As the cost of wireless service has steadily dropped over the last year and as mobile phones have become increasingly common, many people are finding that they can avoid toll charges on their home (phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which) many wireless companies provide unlimited airtime for a small monthly fee (A) phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which (B) phones, instead using mobile phones to make long-distance calls during the night of weekends, during which (C) phones by using their mobile phones to make long-distance calls at night or on weekends, when (D) phones using mobile phones for making long-distance calls during the night or weekends, when (E) phones when using their mobile phones to make long-distance calls at night or on weekends, a time which. OA:C PP2-23 23.Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them (by the use of acoustical signals, but not olfactory ones, and they attract) their mates during the day, rather than at night. (A) by the use of acoustical signals, but not olfactory ones, and they attract (B) by the use of acoustical signals instead of using olfactory ones, and attracting (C) by using acoustical signals, not using olfactory ones, and by attracting (D) using acoustical signals, rather than olfactory ones, and attract (E) using acoustical signals, but not olfactory ones, and attracting OA:D 想请问OV-8 答案C的by using为何是正确的? 虽然用其他解题点可以找到正确答案但跟 PP2-23比较後发现不知道怎麽解这个点，恳请大家帮忙 上网找到飞腾网上是说by Ving..和 using N都可以，但是通常不会用by using N 以下附上网站连结:http://elitefg.com/phpBB3/viewtopic.php?f=23&t=197 我自己本身的理解是by Ving是采取手段达成目的，但这样看来PP2-23的(C)by using并没 有太大的问题，还是说我的理解哪里有误呢? 谢谢! --

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